Officials have identified two brothers, one of whom died, who were caught in a house fire on April 1.

Tyrell Jackson, 3, died from smoke inhalation and "toxic products of combustion," according to a Hamilton County medical examiner's report released today. The child sustained major burns to his face, back, arms and legs, according to diagrams in the report.

Tyler Jackson remains in critical but stable condition at the Joseph M. Still Burn Center in Augusta, Ga.

The cause of the fire is unknown, as is where in the house it began, said Bruce Garner, public information officer for Chattanooga Fire Department.

Firefighters received a call on April 1 about a home at 2014 Rawlings Street that was already engulfed in flames.

Fire investigators reported there was at least one working smoke detector in the home at the time of the fire, Garner said.

Because someone was killed in the fire, Chattanooga police are also investigating.

The boys' mother, Shondell Jackson, was found outside the home when firefighters and police arrived on scene. It remains unclear if she was inside the residence when the fire started.

She had sustained burns and suffered from smoke inhalation. She was treated and released the same day.